![Need help sizing Zener diodes and varistor for 12V automotive power supply protection - Electrical Engineering Stack Exchange Need help sizing Zener diodes and varistor for 12V automotive power supply protection - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/2RJ2R.png)
Need help sizing Zener diodes and varistor for 12V automotive power supply protection - Electrical Engineering Stack Exchange
![Chanzon 34 Values 0.5W Zener Diode Assorted Kit (2V 2.2V 2.4V 2.7V 3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V Chanzon 34 Values 0.5W Zener Diode Assorted Kit (2V 2.2V 2.4V 2.7V 3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V](https://m.media-amazon.com/images/I/81KdDjmvbWL._AC_UF350,350_QL80_.jpg)
Chanzon 34 Values 0.5W Zener Diode Assorted Kit (2V 2.2V 2.4V 2.7V 3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V
![Chanzon 34 Values 0.5W Zener Diode Assorted Kit (2V 2.2V 2.4V 2.7V 3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V Chanzon 34 Values 0.5W Zener Diode Assorted Kit (2V 2.2V 2.4V 2.7V 3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V](https://m.media-amazon.com/images/I/81t9lAFLP6L._AC_UF1000,1000_QL80_.jpg)
Chanzon 34 Values 0.5W Zener Diode Assorted Kit (2V 2.2V 2.4V 2.7V 3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V
![BOJACK 1N5349B 5W 12V Power Zener Diodes 1N5349 5 Watt 12 Volt Axial Diodes T-18(Pack of 30 Pcs): Amazon.com: Industrial & Scientific BOJACK 1N5349B 5W 12V Power Zener Diodes 1N5349 5 Watt 12 Volt Axial Diodes T-18(Pack of 30 Pcs): Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/81vNUysLRRL.jpg)
BOJACK 1N5349B 5W 12V Power Zener Diodes 1N5349 5 Watt 12 Volt Axial Diodes T-18(Pack of 30 Pcs): Amazon.com: Industrial & Scientific
![13values*10pcs=130pcs 1W LL34 Zener diode Kit 3V3 4V7 5V1 6V8 7V5 10V 12V 16V 18V 20V 24V 36V SMD Assorted component diy kit - AliExpress 13values*10pcs=130pcs 1W LL34 Zener diode Kit 3V3 4V7 5V1 6V8 7V5 10V 12V 16V 18V 20V 24V 36V SMD Assorted component diy kit - AliExpress](https://ae01.alicdn.com/kf/S14d9cd82cae84cab9b199b97d8220672m.png_640x640.png_.webp)
13values*10pcs=130pcs 1W LL34 Zener diode Kit 3V3 4V7 5V1 6V8 7V5 10V 12V 16V 18V 20V 24V 36V SMD Assorted component diy kit - AliExpress
![100pcs SOD-123 ZENER DIODE W8 2V 2.4V 2.7V 3V0 3.3V 3V6 3V9 4V3 4V7 5V1 5V6 6V2 6V8 7V5 8V2 9V1 10V 11V 12V 13V 15V 16V 18V 20V - AliExpress 100pcs SOD-123 ZENER DIODE W8 2V 2.4V 2.7V 3V0 3.3V 3V6 3V9 4V3 4V7 5V1 5V6 6V2 6V8 7V5 8V2 9V1 10V 11V 12V 13V 15V 16V 18V 20V - AliExpress](https://ae01.alicdn.com/kf/Hc38553b92b9c4fc99b3b8a5c1d507d1fD/100pcs-SOD-123-ZENER-DIODE-W8-2V-2-4V-2-7V-3V0-3-3V-3V6-3V9.png)
100pcs SOD-123 ZENER DIODE W8 2V 2.4V 2.7V 3V0 3.3V 3V6 3V9 4V3 4V7 5V1 5V6 6V2 6V8 7V5 8V2 9V1 10V 11V 12V 13V 15V 16V 18V 20V - AliExpress
![Amazon.com: Chanzon 30 Values 300pc 1W Zener Diode Assorted Kit (3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V 20V 22V Amazon.com: Chanzon 30 Values 300pc 1W Zener Diode Assorted Kit (3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V 20V 22V](https://m.media-amazon.com/images/I/71YnRyTTnSL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Chanzon 30 Values 300pc 1W Zener Diode Assorted Kit (3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V 20V 22V
![100pcs 3216 SMD Zener Diode SOD-123 1206 10V 11V 12V 13V 15V 18V 20V 22V 24V 27V 30V 33V 36V 39V 43V 47V 51V 56V BZT52C series - AliExpress 100pcs 3216 SMD Zener Diode SOD-123 1206 10V 11V 12V 13V 15V 18V 20V 22V 24V 27V 30V 33V 36V 39V 43V 47V 51V 56V BZT52C series - AliExpress](https://ae01.alicdn.com/kf/S775ce3cd1d7541eaa861745c563e25edw.jpg_640x640Q90.jpg_.webp)
100pcs 3216 SMD Zener Diode SOD-123 1206 10V 11V 12V 13V 15V 18V 20V 22V 24V 27V 30V 33V 36V 39V 43V 47V 51V 56V BZT52C series - AliExpress
![Zener diode as a Voltage regulator, where do the formulas come from? - Electrical Engineering Stack Exchange Zener diode as a Voltage regulator, where do the formulas come from? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/CgiHM.jpg)